You need to use a particular type of permalink while using Dozent LMS on your site. Permalink is the URL stature of a website. You should use Post Name as your Permalink type. This is very crucial as Dozent LMS generates dynamic links constantly.
To do so, go to the WordPress Dashboard > Settings > Permalinks. Then choose Post Name and hit Save Changes.
Note: using any other type of permalink may generate a 404 error on your website.